Stability studies for pharmaceutical products represent a primary stage in the development and manufacture of a new medicinal product, being a fundamental condition that guarantees its quality and efficacy. The research was initiated with the aim of the determining the stability of Dioxoindolinone under stress conditions in order to find out the factors that can induce possible changes in the molecular structure of the Dioxoindolinone, which consequently can lead to a partial or total diminution of the therapeutic effect.